Skiving machine



n 1- F. N. LA CHAPELLEJ I 0, 8

SKIVING MACHINE Filed Nov. 15, 1929 Patented June 16, 1931 v usirse srarss ATENT orrice nnnn LA CHAPELLE, or BEVERLY, MASSACHUSETTS; ASSIGNOR ToUNITEn SHOE.

MACHINERY CORPORATION, or PATERSON, NEW JERSEY, A CORPORATION or NEW JERSEY.

sKrvIN-e MAG INE Application. fiieanovember 15 1929. SeriaI No. 467,344.

This invention relates to skiving machines and is herein illustrated as embodied i'n'a machine of the well-known Amazeentype for skiving leather parts of boots and shoes.

Machines of this general type comprise a rotary disk" skiving blade mounted. in a supporting member at the lower end of a rotary shaft, and a co-operating feed roll and feed disk for feeding the Work to the blade. These blades, Which are rigid, have a slightly con cave or conical surface on their under sides so as toprovide clearance for the work and must be very accurately made in order to produce satisfactory results.

According to one feature. of the present invention as herein illustrated, there is provided a flexible blade and. novel and improved means for bending it into and holding it in proper shape. In. the illustrated construction a blade-supporting member fast to or integral with the lower end of a rotary shaft has a central threaded hole therein, and is recessed to'provide an annular, conical supporting surface; and in order to force the blade against this surface, there is provided a clamping member having a stem threaded into the holein the supporting member and a head which engages the blade. l Vith this construction a normallyifiat blade made of'thin flexible steel'niay be bent into and held in the desired dished shape. By 'cmpi'oyinga flexible blade and bending it into dished shape'i'n the mannerdescribed, the expensive manufacturing process formerly necessary with rigid blades is avoided.

In order to force the blade against the annular conical or otherwise dished supporting surface, it is necessary to exert considerable force in turning the clamping member. Ac

cordin therefore, to another feature of the invention means is provided. for holding the shaft, and with it the supporting member,

' from rotary movement when desired. In the illustrated construction this means takes the form of a fork slidab-le upon a stationary part ofthe machine which may be moved when desired into-engagement with a flattened portion of the shaft.

These and other features of the invention including certain details of construction and combinations of parts will be described as embodied in an illustrated machine and pointed out in the appended claims.

Referring to the accompanying drawings, Fig. 1 is an elevation of a portion of a leatherskiving machine of the Amazeen type Fig. 2 is a plan showing upon an enlarged scale the means for holding the rotary shaft stationary; i

Fig. *3 1s a view on a still'further enlarged male of the blade-supporting member, the

blade and the clamp, a. tool for turning the clamp being shown in dottedlines and Fig. 4 is aplan of the blade on ascale sommvhat smaller than that of Fig. 3. I

Referring first to Fig. l the Work is fed away from the observer by means of a feed roll 5 and a cooperating, fee'ddisk 7 to a rotary blade 9 which is clamped to a blade supporting n'ieniber 11, said member being fast to the lower end of a shaft 13 which rotated by means of a pulley 15 and a belt 11.

Referring now more particularly to Fig. 3,

the blade-supporting member 11 has athreads. edhole 19 in its center which leads into a cylindrical recess 21; and, surrounding the recess, is an annular blade-supporting surface 23 which, in the illustrated construction, is conical but maybe of any suitable dished form; The blade 9, which is normally fiat but i's inade of flexible spring steehisforced againstthis annularsupporting surface by a clamping member having a threaded stem '25 and a head, the head being formed with a cylindrical portion 27 which fits into a central hole 29 in the center of the'blade 9 and.

hasaflange 31 which engages the blade. The inclination of the annular supporting surface 23 to the horizontalis somewhat greater than the inclination of the annular surf-ace of the flange 31 of the clamping member so thatthe clamping member engages the blade 9 only in a narroi'v annular area located between the inner and outer edges 'ofthe annular supporting surface 2'3.- A point-on this narrow an-' nular area is indicated by the a-rro'win Fig. 3. When "the blade 9 is distorted into its dished shape, the inner periphery of the blade 9 tends to ex and "slightly Whilethe outer periphery of the blade is slightly contracted. Internal stresses are set up in the blade which,

if excessive, would result in breakage of the blade. To minimize these stresses, the blade 9 is clamped only along a limited annular area which permits the portions of the blade 9 outside of the limited annular clamping area to accommodate themselves to a dished shape without interference from the clamping action of the supporting member 11 and the clamping member.

The head of the clamping member is provided with two holes 33 to receive the pins 35 of a spanner wrench having a stem 37 at the lower end of which is a handle 39. By manipulating the spanner wrench, when it is in position as shown in Fig. 3, the clamping member may be turned either toloosen it or to tighten it. Then the clamping member is turned to tighten it, considerable force must be exerted in order to bend the blade 9 into itsdished shape; and at such time the shaft 13, which is integral with the supporting member 11, must, of course, be held stationary. To this end the upper end of the shaft is flattened on opposite sides, one of the flattened sides being indicated at 41 in Fig. 3; and a forked member 43 is moved into the position shown in Figs. 1 and 2 to engage the flattened sides of the shaft. This forked member rests upon a stationary part 45 of the machine in which the stem 47 of an ad justable half-bearing for the shaft 13 is slidably mounted, said forked member having at tine end a downwardly extending split lug through which the stem 47 passes. A draw bolt 48, having in it a substantially halfround notch, has threaded on one end a thumb nut 49 by manipulation of which the forked member 43 may be locked to or loosened from the stem 47. 7

Assuming that the parts are in the positions shownand that it is desired to remove and replace a blade, the wrench 39 is turned so as to loosen the clamping member, after which the clamping member may be further un screwed by the operators fingers. The clamping member and the old blade are removed, a new blade is placed upon the annular supporting surface 23, and then the clamping member is screwed tightly into place. During the latter. part of its inward movement, the outer extremity of the flange 31 engages the blade in a narrow annular locality indicated by the arrow in Fig. 3 and forces the blade against the supporting surface 23 thereby imparting a dished shape to the blade.

Although the invention has been set forth as embodied in a particular construction, it should be understood that the invention is not limited in the scope of its application to the particular construction which has been shown and described.

Having thus-described my invention, what I claim as new and desire to secure by Letters Patent of the United Statesis:

1. In a skiving machine, a shaft, a bladesupporting memberrigid with the shaft, said member having a threaded hole therein and being recessed to provide an annular dished supporting surface, a normally flat flexible.

blade circular in outline and having an opening through its center, and a clamping member comprising athreaded stem screwed into the hole in the supporting member, a head extending into the central opening in the blade, and a projecting flange engaging the blade only along a narrow annular area to force it against the supporting surface and thereby impart to it a dished shape.

2. In a skiving machine, a shaft, a bladesupporting member rigid with the shaft, said member having a threaded hole therein and being recessed to provide an annular dished supporting surface, a normally flat flexible blade circular in outline and having an opening through its center, and a clamping memoer comprising a threaded stem screwed into the hole in the supporting member, a head extending into the central opening in the blade, and a projecting flange engaging the blade to force it against the supporting surface, said flange being shaped to engage the blade only in a narrow annular area located between the inner and outer edges of the annular supporting surface.

3. In a skiving machine, a shaft, a. bladesupporting member rigid with the shaft, said member being recessed to provided an annu- 'lar dished supporting surface, a normally flat flexible blade, and a clamping member shaped to engage the blade only in a narrow annular area located between the inner and the outer edges of the annular supporting surface and adapted to force the blade against the surface to flex the blade.

4. In a skiving machine, a shaft, a bladesupporting member rigid with the shaft, said member being recessed to provide an annular conical supporting surface, a normally flat flexible blade, and a clamping member shaped to engage the blade only in a narrow annular area located between the inner and the outer edges of the annular supporting surface and adapted to force the blade against the surface to flex the blade.

In testimony whereof I have signed my name to this specification. Y

FRED N. LA CHAPELLE. 

